This topic comes up frequently, so I figured I'd do a thread on this.
If you have hydraulic quick disconnects/couplers (QD's, QC's) on your machine that leak while CONNECTED, often replacing the O-ring in the female coupler will fix that. A small dental pic or a "pick and hook" set from places like Harbor Freight, Amazon, and other tool suppliers. They are usually under $10.00
If they leak while DISCONNECTED, then the only real answer is to replace the coupler, they are not rebuildable.
Here are the common sizes used, they are available from MANY sources:
For 1/4" ISO 5675 "AG" style couplers:
Size = 113
Durometer = 70A
Material = Buna N
For 1/2" ISO 5675 "AG" style couplers:
Size = 117
Durometer = 70A
Material = Buna N
If you are not sure what size couplers you have, you can look at the downloadable charts and/or the tables we have on our website:
www.boltonhooks.com
We also now sell exact OEM replacement couplers, the same Faster brand JD uses for far less than JD sells them for. There are the ORB/SAE style.
www.boltonhooks.com
If you have hydraulic quick disconnects/couplers (QD's, QC's) on your machine that leak while CONNECTED, often replacing the O-ring in the female coupler will fix that. A small dental pic or a "pick and hook" set from places like Harbor Freight, Amazon, and other tool suppliers. They are usually under $10.00
If they leak while DISCONNECTED, then the only real answer is to replace the coupler, they are not rebuildable.
Here are the common sizes used, they are available from MANY sources:
For 1/4" ISO 5675 "AG" style couplers:
Size = 113
Durometer = 70A
Material = Buna N
For 1/2" ISO 5675 "AG" style couplers:
Size = 117
Durometer = 70A
Material = Buna N
If you are not sure what size couplers you have, you can look at the downloadable charts and/or the tables we have on our website:

Quick Coupler HELP - BoltOnHooks LLC

We also now sell exact OEM replacement couplers, the same Faster brand JD uses for far less than JD sells them for. There are the ORB/SAE style.

Hydraulic Quick Couplers - BoltOnHooks LLC
Bolt-On Hooks and Hydraulic accessories for compact tractors.
